package com.meow_woof.service.impl;

import com.meow_woof.context.BaseContext;
import com.meow_woof.dto.ShoppingCartDTO;
import com.meow_woof.entity.Dish;
import com.meow_woof.entity.Setmeal;
import com.meow_woof.entity.ShoppingCart;
import com.meow_woof.mapper.DishMapper;
import com.meow_woof.mapper.SetmealMapper;
import com.meow_woof.mapper.ShoppingCartMapper;
import com.meow_woof.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.List;

@Slf4j
@Service
public class ShoppingCartServiceImpl implements ShoppingCartService{
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入到购物车中的商品是否已经存在了
        ShoppingCart shoppingCart=new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);

        log.info("{}",shoppingCart);
        Long userId= BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list=shoppingCartMapper.list(shoppingCart);

        //如果已经存在了，只需将数量加一
        if(list!=null&&list.size()>0){
            ShoppingCart cart=list.get(0);
            cart.setNumber(cart.getNumber()+1);//update shopping_cart set number=? where id=?
            shoppingCartMapper.updateNumberById(cart);
        }else {
            //如果不存在，需要插入一条购物车数据
            //判断本次加到购物车的是菜品还是套餐
            Long dishId=shoppingCartDTO.getDishId();
            if(dishId!=null){
                //本次加到购物车的是菜品
                Dish dish=dishMapper.selectById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            } else {
                //本次添加到购物车的是套餐
                Long setmealId =shoppingCartDTO.getSetmealId();
                Setmeal setmeal=setmealMapper.selectById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }


    }

    /**
     * 查看购物车
     *
     * @return
     */
    public List<ShoppingCart> showShoppingCart() {
        //获得当前用户的id
        Long userId=BaseContext.getCurrentId();
        ShoppingCart shoppingCart=ShoppingCart.builder()
                .userId(userId)
                .build();
        List<ShoppingCart> list=shoppingCartMapper.list(shoppingCart);

        return list;
    }

    /**
     * 清空购物车
     *
     * @return
     */
    public void cleanShoppingCart() {
        Long userId=BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }

    /**
     * @param shoppingCartDTO
     */
    @Transactional
    public void subEach(ShoppingCartDTO shoppingCartDTO) {
        Long userId=BaseContext.getCurrentId();
        ShoppingCart shoppingCart=new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);

        log.info("{}",shoppingCart);

       List<ShoppingCart> list=  shoppingCartMapper.list(shoppingCart);
       shoppingCart=list.get(0);
       if (shoppingCart.getNumber()==1){shoppingCartMapper.delete(shoppingCart);}
       else {
           shoppingCart.setNumber(shoppingCart.getNumber() - 1);
           shoppingCartMapper.updateNumberById(shoppingCart);
       }


    }
}
